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參數(shù)資料
| 型號： | MAX3969ETP |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 數(shù)字傳輸電路 |
| 英文描述： | 200Mbps SFP Limiting Amplifier |
| 中文描述： | ATM/SONET/SDH SUPPORT CIRCUIT, QCC20 |
| 封裝： | 4 X 4 MM, 0.80 MM HEIGHT, MO-220WGGD-1, TQFN-20 |
| 文件頁數(shù)： | 5/11頁 |
| 文件大小： | 724K |
| 代理商： | MAX3969ETP |
M
200Mbps SFP Limiting Amplifier
_______________________________________________________________________________________
5
Pin Description
PIN
17, 18
NAME
V
CC
FUNCTION
Supply Voltage
19
SQUELCH
Squelch Input. The squelch function disables the data outputs by forcing OUT- low and OUT+ high
when the signal is below the power-detect threshold. Connect to GND or leave unconnected to
disable squelch. Connect to V
CC
to enable squelch.
20
V
TH
Output of Internal Op Amp that Sets Power-Detect Threshold Voltage (Figure 1). Connect a resistor
from V
TH
to INV (R2) and from INV to ground (R1 = 100k
), to program the desired threshold voltage.
EP
Exposed
Pad
Ground. The exposed pad must be soldered to the circuit board ground for proper thermal and
electrical performance.
OFFSET
CORRECTION
1
1
O
1.2V
REFERENCE
C
IN
C
IN
IN+
FILTER
V
CC
IN-
FWD
FWD
FWD
C
FILTER
C
AZ
CZN
CZP
R1
100k
R2
INV
V
TH
V
CC
V
CCO
GND
OUT-
OUT+
SQUELCH
RSSI
LOS
LOS
SD
MAX3969
PECL
TTL
PECL
Figure 1. Functional Diagram
Detailed Description
The MAX3969 contains a series of limiting amplifiers
and power detectors, offset correction, data-squelch
circuitry, TTL buffers for LOS outputs, and PECL output
buffers for signal detect (SD) and data outputs. See
Figure 1 for the functional diagram.
Gain Stages and Offset Correction
A cascade of limiting amplifiers provides approximately
65dB of combined small-signal gain. The large gain
makes the amplifier susceptible to small DC offsets in
the signal path. To correct DC offsets, the amplifier has
an internal feedback loop that acts as a DC autozero
circuit. By correcting the DC offsets, the limiting amplifi-
er sensitivity and power-detector accuracy are
improved.
The offset correction is optimized for data streams with
a 50% duty cycle. A different average duty cycle results
in increased pulse-width distortion and loss of sensitivi-
ty. The offset-correction circuitry is less sensitive to vari-
ations of input duty cycle (for example, the 40% to 60%
duty cycle encountered in 4B/5B coding) when the
input is less than 30mV
P-P
.
The data inputs must be AC-coupled for the offset cor-
rection loop to function properly. Differential input
impedance is >5k
.
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| MAX3969ETP+ | 功能描述:限幅放大器 270Mbps SFP LED RoHS:否 制造商:Micrel 輸入電壓范圍（最大值）:3.6 V 工作電源電壓:3.3 V 電源電流:40 mA 工作溫度范圍:- 40 C to + 85 C 封裝 / 箱體:MSOP-10 封裝:Tube |
| MAX3969ETP+GH7 | 功能描述:限幅放大器 200Mbps SFP Limiting Amplifier RoHS:否 制造商:Micrel 輸入電壓范圍（最大值）:3.6 V 工作電源電壓:3.3 V 電源電流:40 mA 工作溫度范圍:- 40 C to + 85 C 封裝 / 箱體:MSOP-10 封裝:Tube |
| MAX3969ETP+T | 功能描述:限幅放大器 270Mbps SFP LED RoHS:否 制造商:Micrel 輸入電壓范圍（最大值）:3.6 V 工作電源電壓:3.3 V 電源電流:40 mA 工作溫度范圍:- 40 C to + 85 C 封裝 / 箱體:MSOP-10 封裝:Tube |
| MAX3969ETP+TGH7 | 功能描述:限幅放大器 200Mbps SFP Limiting Amplifier RoHS:否 制造商:Micrel 輸入電壓范圍（最大值）:3.6 V 工作電源電壓:3.3 V 電源電流:40 mA 工作溫度范圍:- 40 C to + 85 C 封裝 / 箱體:MSOP-10 封裝:Tube |
| MAX3969ETPEVKIT | 功能描述:限幅放大器 Evaluation Kit for the MAX3969 RoHS:否 制造商:Micrel 輸入電壓范圍（最大值）:3.6 V 工作電源電壓:3.3 V 電源電流:40 mA 工作溫度范圍:- 40 C to + 85 C 封裝 / 箱體:MSOP-10 封裝:Tube |
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